New variants in the mitochondrial genomes of schizophrenic patients

European Journal of Human Genetics : EJHG
L MartorellE Vilella

Abstract

The impaired mitochondrial function hypothesis in schizophrenia is based on evidence of altered brain metabolism, morphology, biochemistry and gene expression. Mitochondria have their own genome, which is needed to synthesize some of the subunits of the respiratory chain enzymes. Mitochondrial DNA (mtDNA) is maternally inherited and we observed an excess of maternal transmission of schizophrenia in a set of parent-offspring affected pairs. We therefore hypothesized that mutations in the mtDNA may contribute to the complex genetic basis of schizophrenia. The entire mtDNA of six schizophrenic patients with an apparent maternal transmission of the disease was sequenced and compared to the reference sequence. We have identified 50 variants and among these six have not been previously reported. Three of them were missense variants: MTCO2 7750C>A, MTATP6 8857G>A and MTND4 12096T>A. These were maternally inherited because they were also present in the mtDNA of their respective schizophrenic mothers and none of them were found in 95 control individuals. The MTND4 12096T>A (Leu446His) is a heteroplasmic variant present in five of the six mother-offspring patient pairs that triggers a non-conservative substitution in the ND4 subunit of c...Continue Reading

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